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Selecting an industrial Control Valve Warren Globe ValvesGlobe valves have earned their distinction as the preferred control valve style. The flow path through a globe valve spreads a pressure drop through the entire device, while other valve styles tend to concentrate the pressure drop at the vena contracta. The vena contracta is the place in the final control element where flowing velocity is at its maximum, and pressure is at its minimum. It is the place where phenomena such as "flashing", "choking" and "cavitation" originate. Because it slows pressure drop and recovery rates within its body, the globe valve is more resistant than ball, plug and butterfly valves to those counter-productive, sometimes destructive events. This inherent stabilizing characteristic of the globe valve enhances its ability to control a fluid stream. Additionally, ball valves have inherently higher dB levels of audible noise compared to globe valves, contributing to potential OSHA violations, regardless of the now common characterized trims.
Valve Selection • Identify if valve is a
2-way valve for flow, pressure or temperature control or a 3-way mixing, bypass
or diverting application |
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